Moxa Technologies NPort 1240 - Manual (Page 11)

Introduction
DIP Switch No. DIP Switch Setting
Interface & Termination
Resistor Setting
On 4-wire RS-422/485
1
Off 2-wire RS-485
On Termination Resistor on
2
Off Termination Resistor off
NPort 1220/1240 USB-to-Serial Hub User’s Manual 1-7